Some drivers often uses external bvec table, so introduce this helper for this case. It is always safe to access the bio->bi_io_vec in this way for this case.
After converting to this helper, it will becomes a bit easier to evaluate the remaining direct access to bio->bi_io_vec, so it can help to prepare for the following multipage bvec support. Signed-off-by: Ming Lei <[email protected]> --- include/linux/bio.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/bio.h b/include/linux/bio.h index 97cb48f03dc7..8634bd24984c 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -664,6 +664,16 @@ static inline void bio_inc_remaining(struct bio *bio) atomic_inc(&bio->__bi_remaining); } +static inline void bio_init_with_vec_table(struct bio *bio, + struct bio_vec *table, + unsigned max_vecs) +{ + bio_init(bio); + bio->bi_io_vec = table; + bio->bi_max_vecs = max_vecs; +} + + /* * bio_set is used to allow other portions of the IO system to * allocate their own private memory pools for bio and iovec structures. -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
